there seams to be a bug in compose-dimp.js row 1136ff

if (DimpCore.conf.flist) {
             this.createPopdown('sm', {
                 base: 'save_sent_mail',
                 data: DimpCore.conf.flist,
                 input: 'save_sent_mail_mbox',
                 label: 'sent_mail_label'
             });
             this.setPopdownLabel('sm', 
ImpComposeBase.identities[$F('identity')].sm_name);
         }

while uncomment this part, all works fine.

I still get a blank page in the dynamic view by using the compose new 
message link. Only the "Loading..." hint is shown. New message sending 
ist not possible.
No js or css error is shown in firebug.


By fowarding or answering to a message the content of the 
forwarded/answered message ist not shown. While sending this mail the 
content is part of the mail.

Changes have been made in Git (master):

commit d218becb3ae3d69daeaedcef25a229d052ec51b4
Author: Michael M Slusarz <slusarz@horde.org>
Date:   Tue Jul 10 00:19:25 2012 -0600

     Another fix for Bug #11251

  imp/js/compose-dimp.js             |    2 +-
  imp/lib/Dynamic/Compose/Common.php |    6 +++---
  2 files changed, 4 insertions(+), 4 deletions(-)

http://git.horde.org/horde-git/-/commit/d218becb3ae3d69daeaedcef25a229d052ec51b4

Changes have been made in Git (master):

commit 0d1f5587f8ff1d2ab31bf3191c38fa1f60a214cf
Author: Michael M Slusarz <slusarz@horde.org>
Date:   Mon Jul 9 23:08:41 2012 -0600

     Correctly fix Bug #11251: previous fix broke compose screen

  imp/js/compose-dimp.js |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)

http://git.horde.org/horde-git/-/commit/0d1f5587f8ff1d2ab31bf3191c38fa1f60a214cf

Changes have been made in Git (master):

commit 9abe9c04a9fad8addd5791e018769e5735dcf50e
Author: Jan Schneider <jan@horde.org>
Date:   Mon Jul 9 22:27:26 2012 +0200

     Fix JS errors (Bug #11251).

  imp/docs/CHANGES                       |    1 +
  imp/js/compose-dimp.js                 |    2 +-
  imp/package.xml                        |    2 ++
  imp/templates/dynamic/message.html.php |    4 ++++
  4 files changed, 8 insertions(+), 1 deletions(-)

http://git.horde.org/horde-git/-/commit/9abe9c04a9fad8addd5791e018769e5735dcf50e

Thank you. The compose and popup windows now work and I'm able to 
compose messages and view messages in popup window.

Changes have been made in Git (develop):

commit d218becb3ae3d69daeaedcef25a229d052ec51b4
Author: Michael M Slusarz <slusarz@horde.org>
Date:   Tue Jul 10 00:19:25 2012 -0600

     Another fix for Bug #11251

  imp/js/compose-dimp.js             |    2 +-
  imp/lib/Dynamic/Compose/Common.php |    6 +++---
  2 files changed, 4 insertions(+), 4 deletions(-)

http://git.horde.org/horde-git/-/commit/d218becb3ae3d69daeaedcef25a229d052ec51b4

There is still this problem with javascript which prevents compose 
screen from working properly:
Error 2: Uncaught TypeError: Object #<Object> has no method 'size'
File: compose-dimp.js
Line: 1127
Code: if (DimpCore.context.ctx_msg_other.size()) {

Simple fix is to remove the size() method call as that method does not exist:
--- compose-dimp.js.orig        2012-07-10 08:54:14.979028558 +0300
+++ compose-dimp.js     2012-07-10 08:57:36.439150927 +0300
@@ -1124,7 +1124,7 @@
              callback: this.uniqueSubmitCallback.bind(this)
          });

-        if (DimpCore.context.ctx_msg_other.size()) {
+        if (DimpCore.context.ctx_msg_other) {
              DimpCore.addPopdown($('msg_other_options').down('A'), 
'msg_other', {
                  trigger: true
              });

Changes have been made in Git (develop):

commit 0d1f5587f8ff1d2ab31bf3191c38fa1f60a214cf
Author: Michael M Slusarz <slusarz@horde.org>
Date:   Mon Jul 9 23:08:41 2012 -0600

     Correctly fix Bug #11251: previous fix broke compose screen

  imp/js/compose-dimp.js |    2 +-
  1 files changed, 1 insertions(+), 1 deletions(-)

http://git.horde.org/horde-git/-/commit/0d1f5587f8ff1d2ab31bf3191c38fa1f60a214cf

Changes have been made in Git (develop):

commit 9abe9c04a9fad8addd5791e018769e5735dcf50e
Author: Jan Schneider <jan@horde.org>
Date:   Mon Jul 9 22:27:26 2012 +0200

     Fix JS errors (Bug #11251).

  imp/docs/CHANGES                       |    1 +
  imp/js/compose-dimp.js                 |    2 +-
  imp/package.xml                        |    2 ++
  imp/templates/dynamic/message.html.php |    4 ++++
  4 files changed, 8 insertions(+), 1 deletions(-)

http://git.horde.org/horde-git/-/commit/9abe9c04a9fad8addd5791e018769e5735dcf50e

To what is it set?

Yes, the compose window does have that DIV ( /imp/dynamic.php?page=compose )

The problem is when trying to open a single message in a new window 
then that new window  ( /imp/dynamic.php?page=message ) does not have 
DIV section named "dimpLoading".
You are right, DimpCore.context.ctx_msg_other is always set. But the 
error is that it does not seem to have method size().

Errors 1 and 2 cause message popup window to be shown as blank.
Error 2 makes compose window show just text "Loading...".

This had been fixed before the release. If you don't have the 
dimpLoading DIV in your compose window, your setup is broken.
DimpCore.context.ctx_msg_other is *always* set in the compose window.

This situation with blank pages are cause by two errors in javascript code.

Error 1: Uncaught TypeError: Cannot call method 'hide' of null
File: message-dimp.js
Line: 327
Code: $('dimpLoading').hide();

Error 2: Uncaught TypeError: Object #<Object> has no method 'size'
File: compose-dimp.js
Line: 1127
Code: if (DimpCore.context.ctx_msg_other.size()) {

Why? Do you get those error messages when loading the compose window?

Compose window only shows text: "Loading..."

If message is opened in a new window it is shown as blank.

In both cases the text of the window can be read using View Source. So 
the page seems to load ok, but still nothing is shown.

These errors might be related to javascript errors reported on: #11248 #11249

Tested system: RHEL 6.2 (php 5.3.3 + RHEL patches)
Tested browsers: IE 9, Firefox 13.0.1, Opera 12, Chrome 20